CaptureActivity.java

/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;

import java.text.DateFormat;
import java.util.Date;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;

/**
 * This activity opens the camera and does the actual scanning on a background
 * thread. It draws a viewfinder to help the user place the barcode correctly,
 * shows feedback as the image processing is happening, and then overlays the
 * results when a scan is successful.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public final class CaptureActivity extends DecoderActivity {

	private static final String TAG = CaptureActivity.class.getSimpleName();

	private static final Set<ResultMetadataType> DISPLAYABLE_METADATA_TYPES = EnumSet
			.of(ResultMetadataType.ISSUE_NUMBER,
					ResultMetadataType.SUGGESTED_PRICE,
					ResultMetadataType.ERROR_CORRECTION_LEVEL,
					ResultMetadataType.POSSIBLE_COUNTRY);

	private Result savedResultToShow;
	private TextView statusView;
	private View resultView;
	private Result lastResult;
	private IntentSource source;

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.capture);
	}

	@Override
	protected void onResume() {
		super.onResume();

		resultView = findViewById(R.id.result_view);
		statusView = (TextView) findViewById(R.id.status_view);

		lastResult = null;

		resetStatusView();

		// Intent intent = getIntent();

		// SharedPreferences prefs =
		// PreferenceManager.getDefaultSharedPreferences(this);

		source = IntentSource.NONE;
	}

	@Override
	protected void onPause() {
		super.onPause();
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		switch (keyCode) {
		case KeyEvent.KEYCODE_BACK:
			if ((source == IntentSource.NONE || source == IntentSource.ZXING_LINK)
					&& lastResult != null) {
				restartPreviewAfterDelay(0L);
				return true;
			}
		}
		return super.onKeyDown(keyCode, event);
	}

	/*
	 * @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater
	 * menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.capture,
	 * menu); return super.onCreateOptionsMenu(menu); }
	 * 
	 * @Override public boolean onOptionsItemSelected(MenuItem item) { Intent
	 * intent = new Intent(Intent.ACTION_VIEW);
	 * intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET); switch
	 * (item.getItemId()) { case R.id.menu_settings: intent.setClassName(this,
	 * PreferencesActivity.class.getName()); startActivity(intent); break; case
	 * R.id.menu_help: intent.setClassName(this, HelpActivity.class.getName());
	 * startActivity(intent); break; default: return
	 * super.onOptionsItemSelected(item); } return true; }
	 */

	// Put up our own UI for how to handle the decoded contents.
	public void handleDecodeInternally(Result rawResult, Bitmap barcode) {
		viewfinderView.setVisibility(View.GONE);
		statusView.setVisibility(View.GONE);
		resultView.setVisibility(View.VISIBLE);

		ImageView barcodeImageView = (ImageView) findViewById(R.id.barcode_image_view);
		if (barcode == null) {
			barcodeImageView.setImageBitmap(BitmapFactory.decodeResource(
					getResources(), R.drawable.launcher_icon));
		} else {
			barcodeImageView.setImageBitmap(barcode);
		}

		TextView formatTextView = (TextView) findViewById(R.id.format_text_view);
		formatTextView.setText(rawResult.getBarcodeFormat().toString());

		TextView typeTextView = (TextView) findViewById(R.id.type_text_view);
		typeTextView.setText("QR_Code");

		DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.SHORT,
				DateFormat.SHORT);
		String formattedTime = formatter.format(new Date(rawResult
				.getTimestamp()));
		TextView timeTextView = (TextView) findViewById(R.id.time_text_view);
		timeTextView.setText(formattedTime);

		TextView metaTextView = (TextView) findViewById(R.id.meta_text_view);
		View metaTextViewLabel = findViewById(R.id.meta_text_view_label);
		metaTextView.setVisibility(View.GONE);
		metaTextViewLabel.setVisibility(View.GONE);
		Map<ResultMetadataType, Object> metadata = rawResult
				.getResultMetadata();
		if (metadata != null) {
			StringBuilder metadataText = new StringBuilder(20);
			for (Map.Entry<ResultMetadataType, Object> entry : metadata
					.entrySet()) {
				if (DISPLAYABLE_METADATA_TYPES.contains(entry.getKey())) {
					metadataText.append(entry.getValue()).append('\n');
				}
			}
			if (metadataText.length() > 0) {
				metadataText.setLength(metadataText.length() - 1);
				metaTextView.setText(metadataText);
				metaTextView.setVisibility(View.VISIBLE);
				metaTextViewLabel.setVisibility(View.VISIBLE);
			}
		}

		TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view);
		CharSequence displayContents = rawResult.getText();
		contentsTextView.setText(displayContents);
		// Crudely scale betweeen 22 and 32 -- bigger font for shorter text
		int scaledSize = Math.max(22, 32 - displayContents.length() / 4);
		contentsTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, scaledSize);

	}

	public void restartPreviewAfterDelay(long delayMS) {
	    super.restartPreviewAfterDelay(delayMS);
		resetStatusView();
	}

	private void resetStatusView() {
		resultView.setVisibility(View.GONE);
		statusView.setText(R.string.msg_default_status);
		statusView.setVisibility(View.VISIBLE);
		viewfinderView.setVisibility(View.VISIBLE);
		lastResult = null;
	}

}